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United States Patent |
5,657,052
|
Lerude
|
August 12, 1997
|
Keypad dialog terminal
Abstract
A keypad dialog terminal in particular for dialog with a programmable
automatic controller, comprising a casing (1) carrying a dialog screen
(12) and a set of contacts (32) associated with a keypad (22),
characterised in that the casing (1) comprises a casing body (11) carrying
the fixed contacts and a removable dialog module (2) comprising a frame
(21) closed by a visible top membrane (22) which forms various projecting
keys and carries the mobile contacts (26), this frame (21) having
removable locking apparatus (24, 25) adapted to cooperate with conjugate
locking apparatus (14, 15) on the lateral sides of the casing body (11).
Inventors:
|
Lerude; Gerard (Antibes, FR)
|
Assignee:
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AEG Schneider Automation (Valbonne, FR)
|
Appl. No.:
|
425042 |
Filed:
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April 18, 1995 |
Foreign Application Priority Data
Current U.S. Class: |
345/168; 341/22; 341/23; 341/34; 708/131; 708/140; D10/65 |
Intern'l Class: |
G06F 003/00; G09G 005/00 |
Field of Search: |
345/168
364/708.1,709.01,709.1,709.12
341/22,28,34,23
|
References Cited
U.S. Patent Documents
3978328 | Aug., 1976 | Fabry et al. | 364/709.
|
4092527 | May., 1978 | Luecke | 364/709.
|
4279021 | Jul., 1981 | See et al. | 364/709.
|
4890832 | Jan., 1990 | Komaki | 341/23.
|
5373458 | Dec., 1994 | Bishay et al. | 364/708.
|
Primary Examiner: Crosland; Donnie L.
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Claims
I claim:
1. A terminal for entering data, said terminal comprising:
a main body carrying an array of fixed contacts and body elements for
aiding in establishing a releasable locking of a key module in a
cooperating relationship with said array of fixed contacts;
said key module having a top membrane that has projecting portions thereof
defining keys with each defined key carrying a moveable contact engageable
with said fixed contacts when said cooperating relationship is
established; and
said top membrane being placed over and enclosing a frame which carries
frame members for acting with said body elements in establishing said
releasable locking.
2. A terminal as claimed in claim 1, wherein said key module further has a
second membrane mounted beneath the top membrane, said second membrane and
said top membrane being glued to a perimeter area of said frame.
3. A terminal as claimed in claim 1, wherein said moveable contact is
formed as a conductive land beneath each one of the keys of said top
membrane.
4. A terminal as claimed in claim 2, wherein said moveable contact is
formed as a conductive land beneath each one of the keys of said top
membrane.
5. A terminal as claimed in any one of the preceding claims, wherein said
body elements are fashioned as grooves with said frame members being
fashioned as lugs to cooperate therewith in establishing said releasable
locking.
6. A terminal as claimed in claim 5, wherein said grooves each contain an
elastic tongue to engage the lugs in establishing said releasable locking.
Description
The present invention concerns a keypad dialog terminal, in particular for
dialog with a programmable automatic controller, comprising a casing
having a dialog screen and a set of contacts associated with a keypad.
Dialog terminals of the above type are used for dialog with a programmable
automatic controller.
The prior art includes terminals that can be customized by using markings
suited to the language, software and working practises of the user. Such
terminals usually have purely graphical key symbols carried by a film.
An object of the present invention is to provide a dialog terminal the
keypad of which can easily be changed.
The terminal is characterized in that the casing comprises a casing body
carrying the fixed contacts and includes a removable dialog module
constituted by a frame closed by a visible membrane at the top which forms
various projecting keys and carries the mobile contacts, this frame being
provided with removable locking means adapted to cooperate with conjugate
locking means disposed on the lateral sides of the casing body.
In accordance with one feature of the invention the module includes a
bottom membrane under the visible membrane, both membranes being glued to
the perimeter of the frame.
In accordance with another feature of the invention the bottom face of the
top membrane carries conductive lands under the projecting keys, facing
the fixed contacts and adapted to cooperate with the fixed contacts.
In accordance with a further feature of the invention the casing body has
lateral locking grooves on both sides and the walls of the frame have
locking lugs adapted to engage in the grooves.
The invention will now be described in more detail and by way of example
with reference to one embodiment of the invention shown in the appended
drawings, in which:
FIG. 1 is an exploded elevation view of a dialog terminal in accordance
with the invention;
FIG. 2 is a view of a removable module from FIG. 1 in section on A--A;
FIG. 3 is side view of a bottom part of the terminal;
FIG. 4 shows part of FIG. 3 in more detail.
The dialog terminal shown in the drawings includes a casing 1 made up of a
casing body 11 and a back 12 both made of plastics material. The casing
body has a dialog screen 12 of the liquid crystal display (LCD) or some
other type and an on-off button 13. The body is closed by a plate 31
carrying fixed contacts 32 laid out in an orderly manner.
The casing body 1 is associated with a removable dialog module 2 carrying
markings and mobile contacts. It comprises a frame 21 including an opening
211 closed by a top membrane 22 which forms various dome-shaped projecting
keys which can be depressed by the operator and which have on the top face
the key markings or other markings. Under the visible membrane 22 is a
bottom membrane 23 which provides a passage for air between the dome-shape
keys. Both membranes 22 and 23 are glued to the perimeter of the frame 21
on the inside, which stiffens both membranes. The bottom face of the top
membrane 22 carries conductive lands 26 under the projecting keys, facing
the fixed contacts 32 and adapted to cooperate with the fixed contacts.
The dialog module 2 is locked to the casing body 1 by elastic lateral
locking means. The casing body 11 has lateral locking grooves 14 and 15 on
both sides and the walls of the frame 21 have locking lugs 24 and 25. Each
locking groove 14, 15 has a respective elastic tongue 16, 17 which locks
the lug behind a detent.
The module is assembled to the body by engaging the lugs 24, 25 in the
grooves 14, 15 in the direction of the arrow F1 and then pushing the
module towards the screen in the direction of the arrow F2. During this
latter movement in translation the module is locked to the elastic
tongues.
The play between the two parts of the keypad is defined by the tolerance
and the relative position of the module and the body.
Of course, variants, improvements of detail and even the use of equivalent
means can be considered without departing from the scope of the invention.
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